Area Calculator
Calculate the area of various geometric shapes with formulas and examples
Select a Shape
Rectangle
Length × Width
Square
Side × Side
Circle
π × radius²
Triangle
½ × Base × Height
Parallelogram
Base × Height
Trapezoid
½ × (a + b) × h
Ellipse
π × a × b
Rhombus
½ × d₁ × d₂
Rectangle Area Calculator
Area = Length × Width
Rectangle Examples
Room Floor
Length: 4 meters, Width: 3 meters
Area = 4 × 3 = 12 m²
Garden Plot
Length: 10 feet, Width: 6 feet
Area = 10 × 6 = 60 ft²
Circle Area Calculator
Area = π × radius² ≈ 3.14159 × r²
Radius = Diameter ÷ 2
Circle Examples
Pizza
Radius: 8 inches
Area = π × 8² = 201.06 in²
Circular Garden
Diameter: 6 meters (radius = 3m)
Area = π × 3² = 28.27 m²
Triangle Area Calculator
Area = ½ × Base × Height
Triangle Examples
Right Triangle
Base: 6 cm, Height: 4 cm
Area = ½ × 6 × 4 = 12 cm²
Triangular Sign
Base: 2 meters, Height: 1.5 meters
Area = ½ × 2 × 1.5 = 1.5 m²
Area Calculation Tips
📏 Consistent Units
Always use the same units for all measurements. The result will be in square units (e.g., m² for meters).
📐 Measuring Techniques
For irregular shapes, break them down into simpler shapes and add their areas together.
🔢 Precision
Use more decimal places for precise calculations, especially for circles where π is involved.
📊 Real Applications
Area calculations are useful for flooring, painting, gardening, construction, and material estimation.